My iPhone is hacked

No, it is not hacked.

If running iOS 13 or earlier versions, check: Settings - Passwords & Accounts - Accounts - Any rogue entries here? If so, delete the rogue account. 

If running iOS 14, check: Settings - Calendar - Accounts - Any rogue entries here? If so, delete the rogue account. 

The Apple support article is below. 

Remove calendar spam

Video support

No. Your iPhone is fine. They want to trick you to believe your iPhone is hacked.

Recognise and avoid phishing messages, phony support calls and other scams

https://support.apple.com/en-gb/HT204759

Another great resource: Device and Data Access when Personal Safety is At Risk

Because, you clicked on a bogus link in your calendar. The information provided in my post will get rid of the bogus calendar entries that you added to your calendar.

That is a scam popup.

About pop-up ads and windows in Safari

https://support.apple.com/en-gb/HT203987

You are welcome.

Be alert for web sites offering to send Notifications or other such free offers.

ameen233 wrote:

Then my phone isnt hacked yet?

No. The message you see is 100% bogus nonsense.

Please follow the steps in my initial post.